[llvm] [Coroutines] Conditional elide coroutines based on hot/cold information (PR #145831)

[Yuxuan Chen via llvm-commits]

https://github.com/yuxuanchen1997 approved this pull request.

Idea sounds appealing. Would prefer the stats to be integrated with existing optimization remarks too. 

https://github.com/llvm/llvm-project/pull/145831